-- 할일관리 시스템 테이블 생성

-- 할일 아이템 테이블
CREATE TABLE IF NOT EXISTS todo_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    
    -- 기본 정보
    content TEXT NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'scheduled', 'active', 'completed', 'delayed', 'split')),
    
    -- 시간 관리
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    start_date TIMESTAMP WITH TIME ZONE,
    estimated_minutes INTEGER CHECK (estimated_minutes > 0 AND estimated_minutes <= 120),
    completed_at TIMESTAMP WITH TIME ZONE,
    delayed_until TIMESTAMP WITH TIME ZONE,
    
    -- 분할 관리
    parent_id UUID REFERENCES todo_items(id) ON DELETE CASCADE,
    split_order INTEGER,
    
    -- 인덱스
    CONSTRAINT unique_split_order UNIQUE (parent_id, split_order)
);

-- 할일 댓글 테이블
CREATE TABLE IF NOT EXISTS todo_comments (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    todo_item_id UUID NOT NULL REFERENCES todo_items(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    
    content TEXT NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

-- 인덱스 생성
CREATE INDEX IF NOT EXISTS idx_todo_items_user_id ON todo_items(user_id);
CREATE INDEX IF NOT EXISTS idx_todo_items_status ON todo_items(status);
CREATE INDEX IF NOT EXISTS idx_todo_items_start_date ON todo_items(start_date);
CREATE INDEX IF NOT EXISTS idx_todo_items_parent_id ON todo_items(parent_id);
CREATE INDEX IF NOT EXISTS idx_todo_comments_todo_item_id ON todo_comments(todo_item_id);
CREATE INDEX IF NOT EXISTS idx_todo_comments_user_id ON todo_comments(user_id);

-- 트리거: updated_at 자동 업데이트
CREATE OR REPLACE FUNCTION update_todo_comments_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER trigger_todo_comments_updated_at
    BEFORE UPDATE ON todo_comments
    FOR EACH ROW
    EXECUTE FUNCTION update_todo_comments_updated_at();